# TAG: http_port
# Usage: port
# hostname<IMG SRC="images/forum/icons/icon_razz.gif">ort
# 1.2.3.4<IMG SRC="images/forum/icons/icon_razz.gif">ort
#
# The socket addresses where Squid will listen for HTTP client
# requests. You may specify multiple socket addresses.
# There are three forms: port alone, hostname with port, and
# IP address with port. If you specify a hostname or IP
# address, then Squid binds the socket to that specific
# address. This replaces the old &acute;tcp_incoming_address&acute;
# option. Most likely, you do not need to bind to a specific
# address, so you can use the port number alone.
#
# The default port number is 3128.
#
# If you are running Squid in accelerator mode, then you
# probably want to listen on port 80 also, or instead.
#
# The -a command line option will override the *first* port
# number listed here. That option will NOT override an IP
# address, however.
#
# You may specify multiple socket addresses on multiple lines.
#
http_port 3128

# TAG: icp_port
# The port number where Squid sends and receives ICP queries to
# and from neighbor caches. Default is 3130. To disable use
# "0". May be overridden with -u on the command line.
#
#icp_port 3130

# TAG: htcp_port
# The port number where Squid sends and receives HTCP queries to
# and from neighbor caches. Default is 4827. To disable use
# "0".
#
# To enable this option, you must use --enable-htcp with the
# configure script.
#htcp_port 4827

# TAG: mcast_groups
# This tag specifies a list of multicast groups which your server
# should join to receive multicasted ICP queries.
#
# NOTE! Be very careful what you put here! Be sure you
# understand the difference between an ICP _query_ and an ICP
# _reply_. This option is to be set only if you want to RECEIVE
# multicast queries. Do NOT set this option to SEND multicast
# ICP (use cache_peer for that). ICP replies are always sent via
# unicast, so this option does not affect whether or not you will
# receive replies from multicast group members.
#
# You must be very careful to NOT use a multicast address which
# is already in use by another group of caches.
#
# If you are unsure about multicast, please read the Multicast
# chapter in the Squid FAQ (http://squid.nlanr.net/Squid/FAQ/).
#
# Usage: mcast_groups 239.128.16.128 224.0.1.20
#
# By default, Squid doesn&acute;t listen on any multicast groups.
#
#mcast_groups 239.128.16.128

# TAG: tcp_outgoing_address
# TAG: udp_incoming_address
# TAG: udp_outgoing_address
# Usage: tcp_incoming_address 10.20.30.40
# udp_outgoing_address fully.qualified.domain.name
#
# tcp_outgoing_address is used for connections made to remote
# servers and other caches.
# udp_incoming_address is used for the ICP socket receiving packets
# from other caches.
# udp_outgoing_address is used for ICP packets sent out to other
# caches.
#
# The default behavior is to not bind to any specific address.
#
# NOTE, udp_incoming_address and udp_outgoing_address can not
# have the same value (unless it is 0.0.0.0) since they both use
# port 3130.
#
# NOTE, tcp_incoming_address has been removed. You can now
# specify IP addresses on the &acute;http_port&acute; line.
#
#tcp_outgoing_address 0.0.0.0
#udp_incoming_address 0.0.0.0
#udp_outgoing_address 0.0.0.0

# TAG: cache_peer
# To specify other caches in a hierarchy, use the format:
#
# hostname type http_port icp_port
#
# For example,
#
# # proxy icp
# # hostname type port port options
# # -------------------- -------- ----- ----- -----------
# cache_peer parent.foo.net parent 3128 3130 [proxy-only]
# cache_peer sib1.foo.net sibling 3128 3130 [proxy-only]
# cache_peer sib2.foo.net sibling 3128 3130 [proxy-only]
#
# type: either &acute;parent&acute;, &acute;sibling&acute;, or &acute;multicast&acute;.
#
# proxy_port: The port number where the cache listens for proxy
# requests.
#
# icp_port: Used for querying neighbor caches about
# objects. To have a non-ICP neighbor
# specify &acute;7&acute; for the ICP port and make sure the
# neighbor machine has the UDP echo port
# enabled in its /etc/inetd.conf file.
#
# options: proxy-only
# weight=n
# ttl=n
# no-query
# default
# round-robin
# multicast-responder
# closest-only
# no-digest
# no-netdb-exchange
# no-delay
# login=user<IMG SRC="images/forum/icons/icon_razz.gif">assword
# connect-timeout=nn
# digest-url=url
#
# use &acute;proxy-only&acute; to specify that objects fetched
# from this cache should not be saved locally.
#
# use &acute;weight=n&acute; to specify a weighted parent.
# The weight must be an integer. The default weight
# is 1, larger weights are favored more.
#
# use &acute;ttl=n&acute; to specify a IP multicast TTL to use
# when sending an ICP queries to this address.
# Only useful when sending to a multicast group.
# Because we don&acute;t accept ICP replies from random
# hosts, you must configure other group members as
# peers with the &acute;multicast-responder&acute; option below.
#
# use &acute;no-query&acute; to NOT send ICP queries to this
# neighbor.
#
# use &acute;default&acute; if this is a parent cache which can
# be used as a "last-resort." You should probably
# only use &acute;default&acute; in situations where you cannot
# use ICP with your parent cache(s).
#
# use &acute;round-robin&acute; to define a set of parents which
# should be used in a round-robin fashion in the
# absence of any ICP queries.
#
# &acute;multicast-responder&acute; indicates that the named peer
# is a member of a multicast group. ICP queries will
# not be sent directly to the peer, but ICP replies
# will be accepted from it.
#
# &acute;closest-only&acute; indicates that, for ICP_OP_MISS
# replies, we&acute;ll only forward CLOSEST_PARENT_MISSes
# and never FIRST_PARENT_MISSes.
#
# use &acute;no-digest&acute; to NOT request cache digests from
# this neighbor.
#
# &acute;no-netdb-exchange&acute; disables requesting ICMP
# RTT database (NetDB) from the neighbor.
#
# use &acute;no-delay&acute; to prevent access to this neighbor
# from influencing the delay pools.
#
# use &acute;login=user<IMG SRC="images/forum/icons/icon_razz.gif">assword&acute; if this is a personal/workgroup
# proxy and your parent requires proxy authentication.
#
# use &acute;connect-timeout=nn&acute; to specify a peer
# specific connect timeout (also see the
# peer_connect_timeout directive)
#
# use &acute;digest-url=url&acute; to tell Squid to fetch the cache
# digest (if digests are enabled) for this host from
# the specified URL rather than the Squid default
# location.
#
# NOTE: non-ICP neighbors must be specified as &acute;parent&acute;.
#
#cache_peer hostname type 3128 3130

# TAG: cache_peer_domain
# Use to limit the domains for which a neighbor cache will be
# queried. Usage:
#
# cache_peer_domain cache-host domain [domain ...]
# cache_peer_domain cache-host !domain
#
# For example, specifying
#
# cache_peer_domain parent.foo.net .edu
#
# has the effect such that UDP query packets are sent to
# &acute;bigserver&acute; only when the requested object exists on a
# server in the .edu domain. Prefixing the domainname
# with &acute;!&acute; means that the cache will be queried for objects
# NOT in that domain.
#
# NOTE: * Any number of domains may be given for a cache-host,
# either on the same or separate lines.
# * When multiple domains are given for a particular
# cache-host, the first matched domain is applied.
# * Cache hosts with no domain restrictions are queried
# for all requests.
# * There are no defaults.
# * There is also a &acute;cache_peer_access&acute; tag in the ACL
# section.

# TAG: icp_query_timeout (msec)
# Normally Squid will automatically determine an optimal ICP
# query timeout value based on the round-trip-time of recent ICP
# queries. If you want to override the value determined by
# Squid, set this &acute;icp_query_timeout&acute; to a non-zero value. This
# value is specified in MILLISECONDS, so, to use a 2-second
# timeout (the old default), you would write:
#
# icp_query_timeout 2000
#
#icp_query_timeout 0

# TAG: maximum_icp_query_timeout (msec)
# Normally the ICP query timeout is determined dynamically. But
# sometimes it can lead to very large values (say 5 seconds).
# Use this option to put an upper limit on the dynamic timeout
# value. Do NOT use this option to always use a fixed (instead
# of a dynamic) timeout value.
#
# If &acute;icp_query_timeout&acute; is set to zero, then this value is
# ignored.
#maximum_icp_query_timeout 2000

# TAG: mcast_icp_query_timeout (msec)
# For Multicast peers, Squid regularly sends out ICP "probes" to
# count how many other peers are listening on the given multicast
# address. This value specifies how long Squid should wait to
# count all the replies. The default is 2000 msec, or 2
# seconds.
#
#mcast_icp_query_timeout 2000

# TAG: dead_peer_timeout (seconds)
# This controls how long Squid waits to declare a peer cache
# as "dead." If there are no ICP replies received in this
# amount of time, Squid will declare the peer dead and not
# expect to receive any further ICP replies. However, it
# continues to send ICP queries, and will mark the peer as
# alive upon receipt of the first subsequent ICP reply.
#
# This timeout also affects when Squid expects to receive ICP
# replies from peers. If more than &acute;dead_peer&acute; seconds have
# passed since the last ICP reply was received, Squid will not
# expect to receive an ICP reply on the next query. Thus, if
# your time between requests is greater than this timeout, you
# will see a lot of requests sent DIRECT to origin servers
# instead of to your parents.
#
#dead_peer_timeout 10 seconds

# TAG: hierarchy_stoplist
# A list of words which, if found in a URL, cause the object to
# be handled directly by this cache. In other words, use this
# to not query neighbor caches for certain objects. You may
# list this option multiple times.
#
# The default is to directly fetch URLs containing &acute;cgi-bin&acute; or &acute;?&acute;.
#
#hierarchy_stoplist cgi-bin ?

# TAG: no_cache
# A list of ACL elements which, if matched, cause the reply to
# immediately removed from the cache. In other words, use this
# to force certain objects to never be cached.
#
# You must use the word &acute;DENY&acute; to indicate the ACL names which should
# NOT be cached.
#
# There is no default. We recommend you uncomment the following
# two lines.
#
#acl QUERY urlpath_regex cgi-bin \?
#no_cache deny QUERY

# TAG: cache_mem (bytes)
# NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS
# SIZE. IT PLACES A LIMIT ON ONE ASPECT OF SQUID&acute;S MEMORY
# USAGE. SQUID USES MEMORY FOR OTHER THINGS AS WELL.
# YOUR PROCESS WILL PROBABLY BECOME TWICE OR THREE TIMES
# BIGGER THAN THE VALUE YOU PUT HERE
#
# &acute;cache_mem&acute; specifies the ideal amount of memory to be used
# for:
# * In-Transit objects
# * Hot Objects
# * Negative-Cached objects
#
# Data for these objects are stored in 4 KB blocks. This
# parameter specifies the ideal upper limit on the total size of
# 4 KB blocks allocated. In-Transit objects take the highest
# priority.
#
# In-transit objects have priority over the others. When
# additional space is needed for incoming data, negative-cached
# and hot objects will be released. In other words, the
# negative-cached and hot objects will fill up any unused space
# not needed for in-transit objects.
#
# If circumstances require, this limit will be exceeded.
# Specifically, if your incoming request rate requires more than
# &acute;cache_mem&acute; of memory to hold in-transit objects, Squid will
# exceed this limit to satisfy the new requests. When the load
# decreases, blocks will be freed until the high-water mark is
# reached. Thereafter, blocks will be used to store hot
# objects.
#
# The default is 8 Megabytes.
#
cache_mem 32 MB

# TAG: cache_swap_low (percent, 0-100)
# TAG: cache_swap_high (percent, 0-100)
#
# The low- and high-water marks for cache object replacement.
# Replacement begins when the swap (disk) usage is above the
# low-water mark and attempts to maintain utilization near the
# low-water mark. As swap utilization gets close to high-water
# mark object eviction becomes more aggressive. If utilization is
# close to the low-water mark less replacement is done each time.
#
# Defaults are 90% and 95%. If you have a large cache, 5% could be
# hundreds of MB. If this is the case you may wish to set these
# numbers closer together.
#
#cache_swap_low 90
#cache_swap_high 95

# TAG: maximum_object_size (bytes)
# Objects larger than this size will NOT be saved on disk. The
# value is specified in kilobytes, and the default is 4MB. If
# you wish to get a high BYTES hit ratio, you should probably
# increase this (one 32 MB object hit counts for 3200 10KB
# hits). If you wish to increase speed more than your want to
# save bandwidth you should leave this low.
#
# NOTE: if using the LFUDA replacement policy you should increase
# this value to maximize the byte hit rate improvement of LFUDA!
# See replacement_policy below for a discussion of this policy.
#
#maximum_object_size 4096 KB

# TAG: minimum_object_size (bytes)
# Objects smaller than this size will NOT be saved on disk. The
# value is specified in kilobytes, and the default is 0 KB, which
# means there is no minimum.
#minimum_object_size 0 KB

# TAG: cache_dir
# Usage:
#
# cache_dir Type Directory-Name Mbytes Level-1 Level2
#
# You can specify multiple cache_dir lines to spread the
# cache among different disk partitions.
#
# Type specifies the kind of storage system to use. Most
# everyone will want to use "ufs" as the type. If you are using
# Async I/O (--enable async-io) on Linux or Solaris, then you may
# want to try "asyncufs" as the type. Async IO support may be
# buggy, however, so beware.
#
# &acute;Directory&acute; is a top-level directory where cache swap
# files will be stored. If you want to use an entire disk
# for caching, then this can be the mount-point directory.
# The directory must exist and be writable by the Squid
# process. Squid will NOT create this directory for you.
#
# If no &acute;cache_dir&acute; lines are specified, the following
# default will be used: /var/spool/squid.
#
# &acute;Mbytes&acute; is the amount of disk space (MB) to use under this
# directory. The default is 100 MB. Change this to suit your
# configuration.
#
# &acute;Level-1&acute; is the number of first-level subdirectories which
# will be created under the &acute;Directory&acute;. The default is 16.
#
# &acute;Level-2&acute; is the number of second-level subdirectories which
# will be created under each first-level directory. The default
# is 256.
#
#
#
# Diretório em que será salvo o cache de navegação
cache_dir ufs /cache 100 64 64

# TAG: cache_log
# Cache logging file. This is where general information about
# your cache&acute;s behavior goes. You can increase the amount of data
# logged to this file with the "debug_options" tag below.
#
#cache_log /var/log/squid/cache.log

# TAG: cache_store_log
# Logs the activities of the storage manager. Shows which
# objects are ejected from the cache, and which objects are
# saved and for how long. To disable, enter "none". There are
# not really utilities to analyze this data, so you can safely
# disable it.
#
#cache_store_log /var/log/squid/store.log

# TAG: cache_swap_log
# Location for the cache "swap.log." This log file holds the
# metadata of objects saved on disk. It is used to rebuild the
# cache during startup. Normally this file resides in the first
# &acute;cache_dir&acute; directory, but you may specify an alternate
# pathname here. Note you must give a full filename, not just
# a directory. Since this is the index for the whole object
# list you CANNOT periodically rotate it!
#
# If you have more than one &acute;cache_dir&acute;, these swap logs will
# have names such as:
#
# cache_swap_log.00
# cache_swap_log.01
# cache_swap_log.02
#
# The numbered extension (which is added automatically)
# corresponds to the order of the &acute;cache_dir&acute; lines in this
# configuration file. If you change the order of the &acute;cache_dir&acute;
# lines in this file, then these log files will NOT correspond to
# the correct &acute;cache_dir&acute; entry (unless you manually rename
# them). We recommend that you do NOT use this option. It is
# better to keep these log files in each &acute;cache_dir&acute; directory.
#
#cache_swap_log

# TAG: emulate_httpd_log on|off
# The Cache can emulate the log file format which many &acute;httpd&acute;
# programs use. To disable/enable this emulation, set
# emulate_httpd_log to &acute;off&acute; or &acute;on&acute;. The default
# is to use the native log format since it includes useful
# information that Squid-specific log analyzers use.
#
#emulate_httpd_log off

# TAG: log_mime_hdrs on|off
# The Cache can record both the request and the response MIME
# headers for each HTTP transaction. The headers are encoded
# safely and will appear as two bracketed fields at the end of
# the access log (for either the native or httpd-emulated log
# formats). To enable this logging set log_mime_hdrs to &acute;on&acute;.
#
#log_mime_hdrs off

# TAG: useragent_log
# If configured with the "--enable-useragent_log" configure
# option, Squid will write the User-Agent field from HTTP
# requests to the filename specified here. By default
# useragent_log is disabled.
#
#useragent_log none

# TAG: debug_options
# Logging options are set as section,level where each source file
# is assigned a unique section. Lower levels result in less
# output, Full debugging (level 9) can result in a very large
# log file, so be careful. The magic word "ALL" sets debugging
# levels for all sections. We recommend normally running with
# "ALL,1".
#
#debug_options ALL,1

# TAG: log_fqdn on|off
# Turn this on if you wish to log fully qualified domain names
# in the access.log. To do this Squid does a DNS lookup of all
# IP&acute;s connecting to it. This can (in some situations) increase
# latency, which makes your cache seem slower for interactive
# browsing.
#
#log_fqdn off

# TAG: client_netmask
# A netmask for client addresses in logfiles and cachemgr output.
# Change this to protect the privacy of your cache clients.
# A netmask of 255.255.255.0 will log all IP&acute;s in that range with
# the last digit set to &acute;0&acute;.
#
#client_netmask 255.255.255.255

# TAG: ftp_user
# If you want the anonymous login password to be more informative
# (and enable the use of picky ftp servers), set this to something
# reasonable for your domain, like wwwuser@somewhere.net
#
# The reason why this is domainless by default is that the
# request can be made on the behalf of a user in any domain,
# depending on how the cache is used.
# Some ftp server also validate that the email address is valid
# (for example perl.com).
#
#ftp_user Squid@

# TAG: ftp_list_width
# Sets the width of ftp listings. This should be set to fit in
# the width of a standard browser. Setting this too small
# can cut off long filenames when browsing ftp sites.
#
#ftp_list_width 32

# TAG: ftp_passive
# If your firewall does not allow Squid to use passive
# connections, then turn off this option.
ftp_passive on

# TAG: dns_children
# The number of processes spawn to service DNS name lookups.
# For heavily loaded caches on large servers, you should
# probably increase this value to at least 10. The maximum
# is 32. The default is 5.
#
# You must have at least one dnsserver process.
#
#dns_children 5

# TAG: dns_nameservers
# Use this if you want to specify a list of DNS name servers
# (IP addresses) to use instead of those given in your
# /etc/resolv.conf file.
#
# Example: dns_nameservers 10.0.0.1 192.172.0.4
#
#dns_nameservers none

# TAG: unlinkd_program
# Specify the location of the executable for file deletion process.
# This isn&acute;t needed if you are using async-io since it&acute;s handled by
# a thread.
#
#unlinkd_program /usr/bin/unlinkd

# TAG: pinger_program
# Specify the location of the executable for the pinger process.
# This is only useful if you configured Squid (during compilation)
# with the &acute;--enable-icmp&acute; option.
#
#pinger_program /usr/bin/pinger

# TAG: redirect_program
# Specify the location of the executable for the URL redirector.
# Since they can perform almost any function there isn&acute;t one included.
# See the Release-Notes for information on how to write one.
# By default, a redirector is not used.
#
#redirect_program none

# TAG: redirect_children
# The number of redirector processes to spawn. If you start
# too few Squid will have to wait for them to process a backlog of
# URLs, slowing it down. If you start too many they will use RAM
# and other system resources.
#
#redirect_children 5

# TAG: redirect_rewrites_host_header
# By default Squid rewrites any Host: header in redirected
# requests. If you are running a accelerator then this may
# not be a wanted effect of a redirector.
#redirect_rewrites_host_header on

# TAG: redirector_access
# If defined, this access list specifies which requests are
# sent to the redirector processes. By default all requests
# are sent.

# TAG: authenticate_program
# Specify the command for the external authenticator. Such a
# program reads a line containing "username password" and replies
# "OK" or "ERR" in an endless loop. If you use an authenticator,
# make sure you have 1 acl of type proxy_auth. By default, the
# authenticator_program is not used.
#
# If you want to use the traditional proxy authentication,
# jump over to the ../auth_modules/NCSA directory and
# type:
# % make
# % make install
#
# Then, set this line to something like
#
# authenticate_program /usr/bin/ncsa_auth /usr/etc/passwd
#zero
authenticate_program /usr/lib/squid/ncsa_auth /etc/shadow

#
# TAG: authenticate_children
# The number of authenticator processes to spawn (default 5). If you
# start too few Squid will have to wait for them to process a backlog
# of usercode/password verifications, slowing it down. When password
# verifications are done via a (slow) network you are likely to need
# lots of authenticator processes.
#
#authenticate_children 5

# TAG: authenticate_ttl
# The time a checked username/password combination remains cached
# (default 3600). If a wrong password is given for a cached user,
# the user gets removed from the username/password cache forcing
# a revalidation.
#
#authenticate_ttl 3600

# TAG: authenticate_ip_ttl
# With this option you control how long a proxy authentication
# will be bound to a specific IP address. If a request using
# the same user name is received during this time then access
# will be denied and both users are required to reauthenticate
# them selves. The idea behind this is to make it annoying
# for people to share their password to their friends, but
# yet allow a dialup user to reconnect on a different dialup
# port.
#
# The default is 0 to disable the check. Recommended value
# if you have dialup users are no more than 60 (seconds). If
# all your users are stationary then higher values may be
# used.
#
#authenticate_ip_ttl 0

# TAG: request_body_max_size (KB)
# This specifies the maximum size for an HTTP request body.
# In other words, the maximum size of a PUT/POST request.
# A user who attempts to send a request with a body larger
# than this limit receives an "Invalid Request" error message.
# If you set this parameter to a zero, there will be no limit
# imposed.
#request_body_max_size 1 MB

# TAG: reply_body_max_size (KB)
# This option specifies the maximum size of a reply body. It
# can be used to prevent users from downloading very large files,
# such as MP3&acute;s and movies. The reply size is checked twice.
# First when we get the reply headers, we check the
# content-length value. If the content length value exists and
# is larger than this parameter, the request is denied and the
# user receives an error message that says "the request or reply
# is too large." If there is no content-length, and the reply
# size exceeds this limit, the client&acute;s connection is just closed
# and they will receive a partial reply.
#
# NOTE: downstream caches probably can not detect a partial reply
# if there is no content-length header, so they will cache
# partial responses and give them out as hits. You should NOT
# use this option if you have downstream caches.
#
# If you set this parameter to zero (the default), there will be
# no limit imposed.
#reply_body_max_size 0

# TAG: refresh_pattern
# usage: refresh_pattern [-i] regex min percent max [options]
#
# By default, regular expressions are CASE-SENSITIVE. To make
# them case-insensitive, use the -i option.
#
# &acute;Min&acute; is the time (in minutes) an object without an explicit
# expiry time should be considered fresh. The recommended
# value is 0, any higher values may cause dynamic applications
# to be erroneously cached unless the application designer
# has taken the appropriate actions.
#
# &acute;Percent&acute; is a percentage of the objects age (time since last
# modification age) an object without explicit expiry time
# will be considered fresh.
#
# &acute;Max&acute; is an upper limit on how long objects without an explicit
# expiry time will be considered fresh.
#
# options: override-expire
# override-lastmod
# reload-into-ims
# ignore-reload
#
# override-expire enforces min age even if the server
# sent a Expires: header. Doing this VIOLATES the HTTP
# standard. Enabling this feature could make you liable
# for problems which it causes.
#
# override-lastmod enforces min age even on objects
# that was modified recently.
#
# reload-into-ims changes client no-cache or ``reload&acute;&acute;
# to If-Modified-Since requests. Doing this VIOLATES the
# HTTP standard. Enabling this feature could make you
# liable for problems which it causes.
#
# ignore-reload ignores a client no-cache or ``reload&acute;&acute;
# header. Doing this VIOLATES the HTTP standard. Enabling
# this feature could make you liable for problems which
# it causes.
#
# Please see the file doc/Release-Notes-1.1.txt for a full
# description of Squid&acute;s refresh algorithm. Basically a
# cached object is: (the order is changed from 1.1.X)
#
# FRESH if expires < now, else STALE
# STALE if age > max
# FRESH if lm-factor < percent, else STALE
# FRESH if age < min
# else STALE
#
# The refresh_pattern lines are checked in the order listed here.
# The first entry which matches is used. If none of the entries
# match, then the default will be used.
#
#Default:
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern . 0 20% 4320

# TAG: replacement_policy
# The cache replacement policy parameter determines which
# objects are evicted (replaced) when disk space is needed.
# Squid used to have only a single replacement policy, LRU.
# But when built with -DHEAP_REPLACEMENT you can choose
# between two new, enhanced policies:
#
# GDSF: Greedy-Dual Size Frequency
# LFUDA: Least Frequently Used with Dynamic Aging
#
# Both of these policies are frequency based rather than recency
# based, and perform better than LRU.
#
# The GDSF policy optimizes object hit rate by keeping smaller
# popular objects in cache so it has a better chance of getting a
# hit. It achieves a lower byte hit rate than LFUDA though since
# it evicts larger (possibly popular) objects.
#
# The LFUDA policy keeps popular objects in cache regardless of
# their size and thus optimizes byte hit rate at the expense of
# hit rate since one large, popular object will prevent many
# smaller, slightly less popular objects from being cached.
#
# Both policies utilize a dynamic aging mechanism that prevents
# cache pollution that can otherwise occur with frequency-based
# replacement policies.
#
# NOTE: if using the LFUDA replacement policy you should increase
# the value of maximum_object_size above its default of 4096 KB to
# to maximize the potential byte hit rate improvement of LFUDA.
#
# For more information about these cache replacement policies see
# http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html and
# http://fog.hpl.external.hp.com/techr...PL-98-173.html.
#
#replacement_policy LFUDA

# TAG: reference_age
# As a part of normal operation, Squid performs Least Recently
# Used removal of cached objects. The LRU age for removal is
# computed dynamically, based on the amount of disk space in
# use. The dynamic value can be seen in the Cache Manager &acute;info&acute;
# output.
#
# The &acute;reference_age&acute; parameter defines the maximum LRU age. For
# example, setting reference_age to &acute;1 week&acute; will cause objects
# to be removed if they have not been accessed for a week or
# more. The default value is one year.
#
# Specify a number here, followed by units of time. For example:
# 1 week
# 3.5 days
# 4 months
# 2.2 hours
#
# NOTE: this parameter is not used when using the enhanced
# replacement policies, GDSH or LFUDA.
#
#reference_age 1 year

# TAG: quick_abort_min (KB)
# TAG: quick_abort_max (KB)
# TAG: quick_abort_pct (percent)
# The cache can be configured to continue downloading aborted
# requests. This may be undesirable on slow (e.g. SLIP) links
# and/or very busy caches. Impatient users may tie up file
# descriptors and bandwidth by repeatedly requesting and
# immediately aborting downloads.
#
# When the user aborts a request, Squid will check the
# quick_abort values to the amount of data transfered until
# then.
#
# If the transfer has less than &acute;quick_abort_min&acute; KB remaining,
# it will finish the retrieval. Setting &acute;quick_abort_min&acute; to -1
# will disable the quick_abort feature.
#
# If the transfer has more than &acute;quick_abort_max&acute; KB remaining,
# it will abort the retrieval.
#
# If more than &acute;quick_abort_pct&acute; of the transfer has completed,
# it will finish the retrieval.
#
#quick_abort_min 16 KB
#quick_abort_max 16 KB
#quick_abort_pct 95

# TAG: negative_ttl time-units
# Time-to-Live (TTL) for failed requests. Certain types of
# failures (such as "connection refused" and "404 Not Found&quot<IMG SRC="images/forum/icons/icon_wink.gif"> are
# negatively-cached for a configurable amount of time. The
# default is 5 minutes. Note that this is different from
# negative caching of DNS lookups.
#
#negative_ttl 5 minutes

# TAG: positive_dns_ttl time-units
# Time-to-Live (TTL) for positive caching of successful DNS lookups.
# Default is 6 hours (360 minutes). If you want to minimize the
# use of Squid&acute;s ipcache, set this to 1, not 0.
#
#positive_dns_ttl 6 hours

# TAG: range_offset_limit (bytes)
# Sets a upper limit on how far into the the file a Range request
# may be to cause Squid to prefetch the whole file. If beyond this
# limit then Squid forwards the Range request as it is and the result
# is NOT cached.
#
# This is to stop a far ahead range request (lets say start at 17MB)
# from making Squid fetch the whole object up to that point before
# sending anything to the client.
#
# A value of -1 causes Squid to always fetch the object from the
# beginning so that it may cache the result. (2.0 style)
#
# A value of 0 causes Squid to never fetch more than the client
# client requested. (default)
#
#range_offset_limit 0 KB

# TAG: connect_timeout time-units
# Some systems (notably Linux) can not be relied upon to properly
# time out connect(2) requests. Therefore the Squid process
# enforces its own timeout on server connections. This parameter
# specifies how long to wait for the connect to complete. The
# default is two minutes (120 seconds).
#
#connect_timeout 120 seconds

# TAG: peer_connect_timeout time-units
# This parameter specifies how long to wait for a pending TCP
# connection to a peer cache. The default is 30 seconds. You
# may also set different timeout values for individual neighbors
# with the &acute;connect-timeout&acute; option on a &acute;cache_peer&acute; line.
#peer_connect_timeout 30 seconds

# TAG: read_timeout time-units
# The read_timeout is applied on server-side connections. After
# each successful read(), the timeout will be extended by this
# amount. If no data is read again after this amount of time,
# the request is aborted and logged with ERR_READ_TIMEOUT. The
# default is 15 minutes.
#
#read_timeout 15 minutes

# TAG: request_timeout
# How long to wait for an HTTP request after connection
# establishment. For persistent connections, wait this long
# after the previous request completes.
#
#request_timeout 30 seconds

# TAG: client_lifetime time-units
# The maximum amount of time that a client (browser) is allowed to
# remain connected to the cache process. This protects the Cache
# from having a lot of sockets (and hence file descriptors) tied up
# in a CLOSE_WAIT state from remote clients that go away without
# properly shutting down (either because of a network failure or
# because of a poor client implementation). The default is one
# day, 1440 minutes.
#
# NOTE: The default value is intended to be much larger than any
# client would ever need to be connected to your cache. You
# should probably change client_lifetime only as a last resort.
# If you seem to have many client connections tying up
# filedescriptors, we recommend first tuning the read_timeout,
# request_timeout, pconn_timeout and quick_abort values.
#
#client_lifetime 1 day

# TAG: half_closed_clients
# Some clients may shutdown the sending side of their TCP
# connections, while leaving their receiving sides open. Sometimes,
# Squid can not tell the difference between a half-closed and a
# fully-closed TCP connection. By default, half-closed client
# connections are kept open until a read(2) or write(2) on the
# socket returns an error. Change this option to &acute;off&acute; and Squid
# will immediately close client connections when read(2) returns
# "no more data to read."
#
#half_closed_clients on

# TAG: ident_timeout
# Maximum time to wait for IDENT requests. If this is too high,
# and you enabled &acute;ident_lookup&acute;, then you might be susceptible
# to denial-of-service by having many ident requests going at
# once.
#
# Only src type ACL checks are fully supported. A src_domain
# ACL might work at times, but it will not always provide
# the correct result.
#
# This option may be disabled by using --disable-ident with
# the configure script.
#ident_timeout 10 seconds

# TAG: shutdown_lifetime time-units
# When SIGTERM or SIGHUP is received, the cache is put into
# "shutdown pending" mode until all active sockets are closed.
# This value is the lifetime to set for all open descriptors
# during shutdown mode. Any active clients after this many
# seconds will receive a &acute;timeout&acute; message.
#
#shutdown_lifetime 30 seconds

# TAG: miss_access
# Use to force your neighbors to use you as a sibling instead of
# a parent. For example:
#
# acl localclients src 172.16.0.0/16
# miss_access allow localclients
# miss_access deny !localclients
#
# This means that only your local clients are allowed to fetch
# MISSES and all other clients can only fetch HITS.
#
# By default, allow all clients who passed the http_access rules
# to fetch MISSES from us.
miss_access allow all

# TAG: cache_peer_access
# Similar to &acute;cache_peer_domain&acute; but provides more flexibility by
# using ACL elements.
#
# cache_peer_access cache-host allow|deny [!]aclname ...
#
# The syntax is identical to &acute;http_access&acute; and the other lists of
# ACL elements. See the comments for &acute;http_access&acute; below, or
# the Squid FAQ (http://squid.nlanr.net/Squid/FAQ/FAQ-10.html).

# TAG: proxy_auth_realm
# Specifies the realm name which is to be reported to the client for
# proxy authentication (part of the text the user will see when
# prompted their username and password).
#
#proxy_auth_realm Squid proxy-caching web server

# TAG: ident_lookup_access
# A list of ACL elements which, if matched, cause an ident
# (RFC 931) lookup to be performed for this request. For
# example, you might choose to always perform ident lookups
# for your main multi-user Unix boxes, but not for your Macs
# and PCs. By default, ident lookups are not performed for
# any requests.
#
# To enable ident lookups for specific client addresses, you
# can follow this example:
#
# acl ident_aware_hosts src 198.168.1.0/255.255.255.0
# ident_lookup_access allow ident_aware_hosts
# ident_lookup_access deny all
#
# This option may be disabled by using --disable-ident with
# the configure script.
#ident_lookup_access deny all

# TAG: cache_mgr
# Email-address of local cache manager who will receive
# mail if the cache dies. The default is "webmaster."
#
#cache_mgr webmaster

# TAG: cache_effective_user
# TAG: cache_effective_group
#
# If the cache is run as root, it will change its effective/real
# UID/GID to the UID/GID specified below. The default is to
# change to UID to nobody and GID to nogroup.
#
# If Squid is not started as root, the default is to keep the
# current UID/GID. Note that if Squid is not started as root then
# you cannot set http_port to a value lower than 1024.
#
#cache_effective_user nobody
#cache_effective_group nobody

# TAG: visible_hostname
# If you want to present a special hostname in error messages, etc,
# then define this. Otherwise, the return value of gethostname()
# will be used. If you have multiple caches in a cluster and
# get errors about IP-forwarding you must set them to have individual
# names with this setting.
#
#visible_hostname www-cache.foo.org

# TAG: unique_hostname
# If you want to have multiple machines with the same
# &acute;visible_hostname&acute; then you must give each machine a different
# &acute;unique_hostname&acute; so that forwarding loops can be detected.
#
#unique_hostname www-cache1.foo.org

# OPTIONS FOR THE CACHE REGISTRATION SERVICE
# -----------------------------------------------------------------------------
#
# This section contains parameters for the (optional) cache
# announcement service. This service is provided to help
# cache administrators locate one another in order to join or
# create cache hierarchies.
#
# An &acute;announcement&acute; message is sent (via UDP) to the registration
# service by Squid. By default, the announcement message is NOT
# SENT unless you enable it with &acute;announce_period&acute; below.
#
# The announcement message includes your hostname, plus the
# following information from this configuration file:
#
# http_port
# icp_port
# cache_mgr
#
# All current information is processed regularly and made
# available on the Web at http://ircache.nlanr.net/Cache/Tracker/.

# TAG: announce_period
# This is how frequently to send cache announcements. The
# default is `0&acute; which disables sending the announcement
# messages.
#
# To enable announcing your cache, just uncomment the line
# below.
#
#announce_period 1 day

# TAG: announce_host
# TAG: announce_file
# TAG: announce_port
# announce_host and announce_port set the hostname and port
# number where the registration message will be sent.
#
# Hostname will default to &acute;tracker.ircache.net&acute; and port will
# default default to 3131. If the &acute;filename&acute; argument is given,
# the contents of that file will be included in the announce
# message.
#
#announce_host tracker.ircache.net
#announce_port 3131

# TAG: httpd_accel_host
# TAG: httpd_accel_port
# If you want to run Squid as an httpd accelerator, define the
# host name and port number where the real HTTP server is.
#
# If you want virtual host support then specify the hostname
# as "virtual".
#
# NOTE: enabling httpd_accel_host disables proxy-caching and
# ICP. If you want these features enabled also, then set
# the &acute;httpd_accel_with_proxy&acute; option.
#
#httpd_accel_host hostname
#httpd_accel_port port

# TAG: httpd_accel_with_proxy on|off
# If you want to use Squid as both a local httpd accelerator
# and as a proxy, change this to &acute;on&acute;.
#
#httpd_accel_with_proxy off

# TAG: httpd_accel_uses_host_header on|off
# HTTP/1.1 requests include a Host: header which is basically the
# hostname from the URL. Squid can be an accelerator for
# different HTTP servers by looking at this header. However,
# Squid does NOT check the value of the Host header, so it opens
# a big security hole. We recommend that this option remain
# disabled unless you are sure of what you are doing.
#
# However, you will need to enable this option if you run Squid
# as a transparent proxy. Otherwise, virtual servers which
# require the Host: header will not be properly cached.
#httpd_accel_uses_host_header off

# TAG: dns_testnames
# The DNS tests exit as soon as the first site is successfully looked up
#
# If you want to disable DNS tests, do not comment out or delete this
# list. Instead use the -D command line option
#
#dns_testnames netscape.com internic.net nlanr.net microsoft.com

# TAG: logfile_rotate
# Specifies the number of logfile rotations to make when you
# type &acute;squid -k rotate&acute;. The default is 10, which will rotate
# with extensions 0 through 9. Setting logfile_rotate to 0 will
# disable the rotation, but the logfiles are still closed and
# re-opened. This will enable you to rename the logfiles
# yourself just before sending the rotate signal.
#
# Note, the &acute;squid -k rotate&acute; command normally sends a USR1
# signal to the running squid process. In certain situations
# (e.g. on Linux with Async I/O), USR1 is used for other
# purposes, so -k rotate uses another signal. It is best to get
# in the habit of using &acute;squid -k rotate&acute; instead of &acute;kill -USR1
# <pid>&acute;.
#
#logfile_rotate 4

# TAG: append_domain
# Appends local domain name to hostnames without any dots in
# them. append_domain must begin with a period.
#
#append_domain .yourdomain.com

# TAG: tcp_recv_bufsize (bytes)
# Size of receive buffer to set for TCP sockets. Probably just
# as easy to change your kernel&acute;s default. Set to zero to use
# the default buffer size.
#
#tcp_recv_bufsize 0 bytes

# TAG: err_html_text
# HTML text to include in error messages. Make this a "mailto"
# URL to your admin address, or maybe just a link to your
# organizations Web page.
#
# To include this in your error messages, you must rewrite
# the error template files (found in the "errors" directory).
# Wherever you want the &acute;err_html_text&acute; line to appear,
# insert a %L tag in the error template file.
#err_html_text

# TAG: deny_info
# Usage: deny_info err_page_name acl
# Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys
#
# This can be used to return a ERR_ page for requests which
# do not pass the &acute;http_access&acute; rules. A single ACL will cause
# the http_access check to fail. If a &acute;deny_info&acute; line exists
# for that ACL then Squid returns a corresponding error page.
#
# You may use ERR_ pages that come with Squid or create your own pages
# and put them into the configured errors/ directory.

# TAG: memory_pools_limit (bytes)
# Used only with memory_pools on:
# memory_pools_limit 50 MB
#
# If set to a non-zero value, Squid will keep at most the specified
# limit of allocated (but unused) memory in memory pools. All free()
# requests that exceed this limit will be handled by your malloc
# library. Squid does not pre-allocate any memory, just safe-keeps
# objects that otherwise would be free()d. Thus, it is safe to set
# memory_pools_limit to a reasonably high value even if your
# configuration will use less memory.
#
# If not set (default) or set to zero, Squid will keep all memory it
# can. That is, there will be no limit on the total amount of memory
# used for safe-keeping.
#
# To disable memory allocation optimization, do not set
# memory_pools_limit to 0. Set memory_pools to "off" instead.
#
# An overhead for maintaining memory pools is not taken into account
# when the limit is checked. This overhead is close to four bytes per
# object kept. However, pools may actually _save_ memory because of
# reduced memory thrashing in your malloc library.

# TAG: forwarded_for on|off
# If set, Squid will include your system&acute;s IP address or name
# in the HTTP requests it forwards. By default it looks like
# this:
#
# X-Forwarded-For: 192.1.2.3
#
# If you disable this, it will appear as
#
# X-Forwarded-For: unknown
#
#forwarded_for on

# TAG: log_icp_queries on|off
# If set, ICP queries are logged to access.log. You may wish
# do disable this if your ICP load is VERY high to speed things
# up or to simplify log analysis.
#
#log_icp_queries on

# TAG: icp_hit_stale on|off
# If you want to return ICP_HIT for stale cache objects, set this
# option to &acute;on&acute;. If you have sibling relationships with caches
# in other administrative domains, this should be &acute;off&acute;. If you only
# have sibling relationships with caches under your control, then
# it is probably okay to set this to &acute;on&acute;.
#
#icp_hit_stale off

# TAG: minimum_direct_hops
# If using the ICMP pinging stuff, do direct fetches for sites
# which are no more than this many hops away.
#
#minimum_direct_hops 4

# TAG: store_objects_per_bucket
# Target number of objects per bucket in the store hash table.
# Lowering this value increases the total number of buckets and
# also the storage maintenance rate. The default is 50.
#
#store_objects_per_bucket 50

# TAG: netdb_low
# TAG: netdb_high
# The low and high water marks for the ICMP measurement
# database. These are counts, not percents. The defaults are
# 900 and 1000. When the high water mark is reached, database
# entries will be deleted until the low mark is reached.
#
#netdb_low 900
#netdb_high 1000

# TAG: netdb_ping_period
# The minimum period for measuring a site. There will be at
# least this much delay between successive pings to the same
# network. The default is five minutes.
#
#netdb_ping_period 5 minutes

# TAG: query_icmp on|off
# If you want to ask your peers to include ICMP data in their ICP
# replies, enable this option.
#
# If your peer has configured Squid (during compilation) with
# &acute;--enable-icmp&acute; then that peer will send ICMP pings to origin server
# sites of the URLs it receives. If you enable this option then the
# ICP replies from that peer will include the ICMP data (if available).
# Then, when choosing a parent cache, Squid will choose the parent with
# the minimal RTT to the origin server. When this happens, the
# hierarchy field of the access.log will be
# "CLOSEST_PARENT_MISS". This option is off by default.
#
#query_icmp off

# TAG: test_reachability on|off
# When this is &acute;on&acute;, ICP MISS replies will be ICP_MISS_NOFETCH